[Lazarus] Crayon physics written in Pascal

[Anthony Walter]

In less than 500 lines of code, I created a crayon physics demo program
using Free Pascal. Check it out at the link below. Source code is included
at the bottom of the page.

https://www.getlazarus.org/videos/physics/catapult/

I've tested it out and it runs well on Windows, Linux, Mac, and smoothly on
Raspberry Pi (using the OpenGL ES2 backend).
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